Google Capital is investing $50 million in Auction.com, valuing the online real-estate marketplace at $1.2 billion, according to an Auction.com press release.

The Auction.com deal is the fourth by Google Capital, which takes minority stakes in later-stage private companies. It follows an investment last month in Renaissance Learning and previous investments in Lending Club and Survey Monkey.

Google formed Google Capital last year, but formally disclosed it last month. Google committed $300 million to the fund for this year, a person familiar with the matter has said.

Google Capital is led by David Lawee, the former head of Google’s corporate development team, which most recently concluded a deal to buy Nest Labs.

Google has a third investment arm specializing in minority investments in early-stage companies, Google Ventures. Neither Google Capital nor Google Ventures has outside investors, as investment funds for both are provided by Google itself.

Auction.com, based in Irvine, Calif., was founded in 2007. Private equity firm Stone Point Capital acquired a stake in 2008. The company sparked talk of a potential initial public offering last year when it hired business software veteran Bruce Felt as its chief financial officer. Felt previously helped take SuccessFactors public and sell the software maker to SAP in 2012.

Auction.com says that over $7 billion worth of commercial and residential real estate traded hands on its platform in 2013.